Fuel cell



FIG. 1 is a perspective view of a fuel cell, showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line portion of the figure drawings is included to show portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a fuel cell, as shown and described. 